/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.skatiger.jrove.compiler;

import java.io.IOException;

import javax.el.ELContext;
import javax.el.ExpressionFactory;

import org.skatiger.jrove.ViewContext;

/**
 * text instruction
 *
 */
interface Instruction {
    /**
     * text instruction 
     * @param factory
     * @param ctx
     * @return
     */
    public Instruction apply(ExpressionFactory factory, ELContext ctx);

    /**
     * is literal text instruction
     * @return
     */
    public boolean isLiteral();

    /**
     * write text instruction
     * @param context {@link ViewContext}
     * @throws IOException write ioexception
     */
    public void write(ViewContext context) throws IOException;
}
